Add process for PR acceptance, review, rejection

This is an extremely tentative PR.  However, I feel that the suggestions are generally good.

Docker-DCO-1.1-Signed-off-by: Timothy Hobbs <timothyhobbs@seznam.cz> (github: timthelion)
@thaJeztah I think that @fredlf is pronouncing "LGTM" as El-Gee-Tee-Em in his head and therefore needs the 'n' to feel satisfied.  However, I pronounce it as "looks good to me" in my head and therefore need there to not be an 'n'.